Double Difference Ambiguity Resolution for GLONASS/GPS Carrier Phase
1999
The satellite constellation and the signal structure of the
Russian GLONASS and the US GPS are comparable.
GLONASS observations can be processed similarly to
GPS data, if the differences in the reference frame, the
system time and in the frequencies of the satellite signals
are taken into consideration. The last item leads to a new
term in the double difference phase observation equation
and may destroy the integer nature of the ambiguities.
This new term depends on the wavelength difference of
the two satellites involved and the error in the initial sin-gle difference ambiguities. In order to account for the
new term, we use an iterative ambiguity resolution algo-rithm
and solve for one double difference ambiguity in
each iteration step. In the first iteration step the ambiguity
with the smallest rms error, resp. the smallest wavelength
difference of the two satellites, will be fixed to an integer
number if certain criteria are fulfilled. Each successfully
resolved double difference ambiguity of a satellite pair
with different wavelengths leads to an improved accuracy
of the single difference ambiguities in the next iteration
step. Thus, the new term is getting smaller with each it-eration
step and this should finally allow to resolve the
double difference ambiguities for all satellite pairs.
The algorithm is mainly suited for static GLONASS/GPS
processing of long sessions ( ³ 1 hour). We show the re-sults
of the ambiguity resolution of two baselines having
a length of 5 m and 6.6 km, respectively.
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